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<head><meta charset="utf-8"><title>I-prioritize #74498 LTO triggers apparent miscompilation on · t-compiler/wg-prioritization/alerts · Zulip Chat Archive</title></head>
<h2>Stream: <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/index.html">t-compiler/wg-prioritization/alerts</a></h2>
<h3>Topic: <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2374498.20LTO.20triggers.20apparent.20miscompilation.20on.html">I-prioritize #74498 LTO triggers apparent miscompilation on</a></h3>

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<a name="204344825"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize%20%2374498%20LTO%20triggers%20apparent%20miscompilation%20on/near/204344825" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> triagebot <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2374498.20LTO.20triggers.20apparent.20miscompilation.20on.html#204344825">(Jul 19 2020 at 11:21)</a>:</h4>
<p><span class="user-group-mention" data-user-group-id="3111">@WG-prioritization/alerts</span> issue <a href="https://github.com/rust-lang/rust/issues/74498">#74498</a> has been requested for prioritization.</p>
<h1><a href="https://hackmd.io/WJ0G17DHTHGgv0OW9I2PxA?view#Unprioritized-I-prioritize">Procedure</a></h1>
<ul>
<li>Priority?</li>
<li>Regression?</li>
<li>Notify people/groups?</li>
<li>Needs <code>I-nominated</code>?</li>
</ul>



<a name="204344966"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize%20%2374498%20LTO%20triggers%20apparent%20miscompilation%20on/near/204344966" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> lcnr <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2374498.20LTO.20triggers.20apparent.20miscompilation.20on.html#204344966">(Jul 19 2020 at 11:24)</a>:</h4>
<p>looks like <code>P-critical</code> to me. It's a fairly simple miscompilation on a tier 1 target afaict</p>



<a name="204346375"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize%20%2374498%20LTO%20triggers%20apparent%20miscompilation%20on/near/204346375" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Léo Lanteri Thauvin <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2374498.20LTO.20triggers.20apparent.20miscompilation.20on.html#204346375">(Jul 19 2020 at 12:03)</a>:</h4>
<p>Pinged LLVM and Windows groups</p>



<a name="204346480"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize%20%2374498%20LTO%20triggers%20apparent%20miscompilation%20on/near/204346480" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Léo Lanteri Thauvin <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2374498.20LTO.20triggers.20apparent.20miscompilation.20on.html#204346480">(Jul 19 2020 at 12:06)</a>:</h4>
<p>I agree with <code>P-critical</code>, this seems really bad:</p>
<blockquote>
<p>I originally noticed this when a project that worked on 1.44.1 suddenly started failing with huge memory allocations on 1.45, so this table specifically applies to this repro, not whatever the underlying bug is.</p>
</blockquote>



<a name="204347117"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize%20%2374498%20LTO%20triggers%20apparent%20miscompilation%20on/near/204347117" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Léo Lanteri Thauvin <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2374498.20LTO.20triggers.20apparent.20miscompilation.20on.html#204347117">(Jul 19 2020 at 12:25)</a>:</h4>
<p>Apparently this is a MSVC-only issue, but I still think it is <code>P-critical</code></p>



<a name="204518614"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize%20%2374498%20LTO%20triggers%20apparent%20miscompilation%20on/near/204518614" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> triagebot <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2374498.20LTO.20triggers.20apparent.20miscompilation.20on.html#204518614">(Jul 21 2020 at 07:29)</a>:</h4>
<p>Issue <a href="https://github.com/rust-lang/rust/issues/74498">#74498</a>'s prioritization request has been removed.</p>



<hr><p>Last updated: Aug 07 2021 at 22:04 UTC</p>
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